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Fig. 9

Top: column density probability distribution function (N-PDF) for all 3 deg tiles overplotted. Only the | b | < 1° regions are considered due to the increasing noise towards the edges of the ATLASGAL fields. Red lines show the fields, which include the Galactic centre. Bottom: the N-PDF of the inner Galaxy (| ℓ | < 60°). Green dashed line shows a log-normal function with σ = 0.41 at a peak of NH2 = 1.10 × 1022 cm-2. Red dotted line shows where excess from the power-law tail sets in at NH2 = 2.92 × 1022 cm-2.

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